Screw-wrench.



P. MEYER.

SCREW WRENGH.

APPLICATION rum) 82M. 1, 1910.

Patented Jan. 23, 1912.-

onTTEn STATES PATENT oEEroE.

PAUL MEYER, 0F SOLINGEN, GERMANY, ASSIGNOR OF ONE-HALF TO MAX HOLDEN, OFSOLIN'GEN, GERMANY.

SCREW-WRENCH.

To all whom it may concern:

Be it known that I, PAUL MEYER, a subject of the German Emperor, andresident of Solingen, Germany, have invented certain new and usefulImprovements in Screw- Wrenches, of which the following is aspecification.

This invention relates to an improved screw-wrench of ratchet likeaction, of which the novelty consists in that the open key of the sameengages a six-cornered nut on five sides and that any spring or similarauxiliary means are omitted.

In the accompanying drawing, Figures 1 and 2 show side views of theimproved screw-wrench with closed key and open key respectively.

The open key of the wrench possesses two fixed jaw faces a: and b. andthree pivotal jaw faces 0, cl, 6 which are integral with each other andfulcrumed on a bolt f. The outer jaw face 0 is an extension ofthelateral jaw face (Z while the jaw face e forms fiche foot of thelatter and the base of the The improved screw-wrench can be placedsidewise over the nut in any position of the same, as the pivotal jawmember is turned aside, when pressed against the nut, so far that thenut can enter the key. The key is then immediately closed around the nutby the latter pressing against the base jaw face 6. The more the key isclosed, the firmer it engages the nut, a slipping-off of the sameSpecification of Letters latent.

Patented Jan. 23, 1912.

Application filed September 1, 1910. Serial No. 579,995.

being impossible, due to the fifth jaw face 0. Upon turning the wrenchback, the jaw faces a and b are removed from the nut, while the pivotaljaw member still embraces the nut .on three sides. On the pivot of themovable member an abutment w is provided, which permits a turning-backof the fixed jaw faces a and I) so far only that the key can turn overthe nut, whereby the ratchetlike action is obtained.

Beneath the base j'aw face 6 a projection g is provided, which in theclosed position of' the key engages a corresponding recess h in the bodyof the key and which thereby serves to compensate the lateral strainexerted by the operation of the wrench.

I claim:

In a screw-wrench of ratchet-like action for six-cornered screw-nuts, incombination, an open key having a recess and consisting of two fixed jawfaces and three integral pivotal aw faces adapted to engage the nut onfive sides, and a projection on said pivotal jaw face member adapted toengage said recess upon the key being in closed position, for thepurpose set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

PAUL MEYER. [n s.]

Witnesses CHAS. J. WRIGHT, ALFRED HENKEL.

copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

